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HCH1 and HCH2 use completely different ECUs/Programs. The "patch" that tweaks the IMA effectiveness only applies to the HCH2. There may or may not be something similar for the HCH1, but I don't know about it.
HCH2 IMA system has 50% more motive power, 10% more total batteries/voltage with 15% less capacity and improved internal resistance. The increase in total motor output taxed the battery system more than anticipated even with the battery pack improvements. The end results were abnormally high battery pack failure and altering the ECU (technically the BCM, I think) programming to be less demanding of the battery for most routine driving. Heavy acceleration will still get the full 20hp of the HCH2 IMA motor provided the battery can deliver it, but for less time due to the more conservative battery management.
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